﻿/*
* Supersubs v0.2b - jQuery plugin
* Copyright (c) 2008 Joel Birch
*
* Dual licensed under the MIT and GPL licenses:
* 	http://www.opensource.org/licenses/mit-license.php
* 	http://www.gnu.org/licenses/gpl.html
*
*
* This plugin automatically adjusts submenu widths of suckerfish-style menus to that of
* their longest list item children. If you use this, please expect bugs and report them
* to the jQuery Google Group with the word 'Superfish' in the subject line.
*
*/

; (function ($) { // $ will refer to jQuery within this closure

    $.fn.supersubs = function (options) {
        var opts = $.extend({}, $.fn.supersubs.defaults, options);
        // return original object to support chaining
        return this.each(function () {
            // cache selections
            var $$ = $(this);
            // support metadata
            var o = $.meta ? $.extend({}, opts, $$.data()) : opts;
            // get the font size of menu.
            // .css('fontSize') returns various results cross-browser, so measure an em dash instead
            var fontsize = $('<li id="menu-fontsize">&#8212;</li>').css({
                'padding': 0,
                'position': 'absolute',
                'top': '-999em',
                'width': 'auto'
            }).appendTo($$).width(); //clientWidth is faster, but was incorrect here
            // remove em dash
            $('#menu-fontsize').remove();
            // cache all ul elements
            $ULs = $$.find('ul');
            // loop through each ul in menu
            $ULs.each(function (i) {
                // cache this ul
                var $ul = $ULs.eq(i);
                // get all (li) children of this ul
                var $LIs = $ul.children();
                // get all anchor grand-children
                var $As = $LIs.children('a');
                // force content to one line and save current float property
                var liFloat = $LIs.css('white-space', 'nowrap').css('float');
                // remove width restrictions and floats so elements remain vertically stacked
                var emWidth = $ul.add($LIs).add($As).css({
                    'float': 'none',
                    'width': 'auto'
                })
                // this ul will now be shrink-wrapped to longest li due to position:absolute
                // so save its width as ems. Clientwidth is 2 times faster than .width() - thanks Dan Switzer
				.end().end()[0].clientWidth / fontsize;
                // add more width to ensure lines don't turn over at certain sizes in various browsers
                emWidth += o.extraWidth;
                // restrict to at least minWidth and at most maxWidth
                if (emWidth > o.maxWidth) { emWidth = o.maxWidth; }
                else if (emWidth < o.minWidth) { emWidth = o.minWidth; }
                emWidth += 'em';
                // set ul to width in ems
                $ul.css('width', emWidth);
                // restore li floats to avoid IE bugs
                // set li width to full width of this ul
                // revert white-space to normal
                $LIs.css({
                    'float': liFloat,
                    'width': '100%',
                    'white-space': 'normal'
                })
                // update offset position of descendant ul to reflect new width of parent
				.each(function () {
				    var $childUl = $('>ul', this);
				    var offsetDirection = $childUl.css('left') !== undefined ? 'left' : 'right';
				    $childUl.css(offsetDirection, emWidth);
				});
            });

        });
    };
    // expose defaults
    $.fn.supersubs.defaults = {
        minWidth: 9, 	// requires em unit.
        maxWidth: 25, 	// requires em unit.
        extraWidth: 0			// extra width can ensure lines don't sometimes turn over due to slight browser differences in how they round-off values
    };

})(jQuery); // plugin code ends
